A TRAPEZOIDAL-WAVE ELECTROMAGNETIC BLOOD FLOWMETER

Description

The electromagnetic flowmeter is an instrument that measures the velocity of a fluid moving in a tube or pipe. By constraining the vessel in a sleeve, flow may be measured directly. A magnetic field crosses the tube at 90 deg to the axis of the tube and to the plane of the electrcdes. As the ions in the fiuid pass the magnetic field, a voltage is induced in the electrode. This fiowmeter is different from existing fiowmeters because of the unique trapezoidal waveform that energizes the magnet. It was found that there are serious difficulties with electromagnetic flowmeters using sine ...
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Description

The electromagnetic flowmeter is an instrument that measures the velocity of a fluid moving in a tube or pipe. By constraining the vessel in a sleeve, flow may be measured directly. A magnetic field crosses the tube at 90 deg to the axis of the tube and to the plane of the electrcdes. As the ions in the fiuid pass the magnetic field, a voltage is induced in the electrode. This fiowmeter is different from existing fiowmeters because of the unique trapezoidal waveform that energizes the magnet. It was found that there are serious difficulties with electromagnetic flowmeters using sine waves or square waves. The trapezoidal-wave electromagnetic blocd flowmeter is described. This new flowmeter is compared with other types of electromagnetic flowmeters. The construction of the transducer element is also discussed. (auth)

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